Add a new expression class, ObjCSuperExpr, to handle the Objective-C 'super'. Remove ObjCThis from PredefinedExpr

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@58698 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaExprObjC.cpp b/lib/Sema/SemaExprObjC.cpp
index a474b7e..bc2f7f2 100644
--- a/lib/Sema/SemaExprObjC.cpp
+++ b/lib/Sema/SemaExprObjC.cpp
@@ -193,8 +193,7 @@
     if (getCurMethodDecl()->isInstance()) {
       QualType superTy = Context.getObjCInterfaceType(ClassDecl);
       superTy = Context.getPointerType(superTy);
-      ExprResult ReceiverExpr = new PredefinedExpr(SourceLocation(), superTy,
-          PredefinedExpr::ObjCSuper);
+      ExprResult ReceiverExpr = new ObjCSuperExpr(SourceLocation(), superTy);
       // We are really in an instance method, redirect.
       return ActOnInstanceMessage(ReceiverExpr.Val, Sel, lbrac, rbrac,
                                   Args, NumArgs);